Help me name some baby bunnies?

So I live on campus at a university in California which has some resident domestic bunnies running around by the dorms. There are 4 full grown bunnies I see all the time, who I call Molly, George, Sirius and Bellatrix. On Monday, everyone started seeing baby bunnies! By their coloring I'm pretty sure their parents are Molly and Sirius. There are 3 black ones and a gray one.

Anyway, I need names for them (though I'm sure everyone else on campus will have different names for them.) I have no idea what genders they are, but odds are they're some of both. The smallest black one definitely seems like a Norbert. For the other three, I'm not sure if I should stick with the HP theme, name them after other dragons in pop culture, come up with a new theme altogether, or just name them randomly. Any suggestions?